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Re: [PATCH v1 5/5] virito-mem: Implement get_min_alignment()
From: |
Pankaj Gupta |
Subject: |
Re: [PATCH v1 5/5] virito-mem: Implement get_min_alignment() |
Date: |
Sat, 26 Sep 2020 23:23:46 +0200 |
> This allows auto-assignment of a properly aligned address in guest
> physical address space. For example, when specifying a 2GB block size
> for a virtio-mem device with 10GB with a memory setup "-m 4G, 20G",
> we'll no longer fail when realizing.
>
> Cc: "Michael S. Tsirkin" <mst@redhat.com>
> Cc: Wei Yang <richardw.yang@linux.intel.com>
> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
> Cc: Igor Mammedov <imammedo@redhat.com>
> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
> hw/virtio/virtio-mem-pci.c | 14 ++++++++++++++
> hw/virtio/virtio-mem.c | 8 ++++++++
> 2 files changed, 22 insertions(+)
>
> diff --git a/hw/virtio/virtio-mem-pci.c b/hw/virtio/virtio-mem-pci.c
> index 590cec041b..2bfa2474fb 100644
> --- a/hw/virtio/virtio-mem-pci.c
> +++ b/hw/virtio/virtio-mem-pci.c
> @@ -75,6 +75,19 @@ static void virtio_mem_pci_fill_device_info(const
> MemoryDeviceState *md,
> info->type = MEMORY_DEVICE_INFO_KIND_VIRTIO_MEM;
> }
>
> +static uint64_t virtio_mem_pci_get_min_alignment(const MemoryDeviceState *md)
> +{
> + /*
> + * If no block size was configured, returns the default block size.
> + * Before the device was realized, this might be smaller than the
> + * final block size (because it ignores the page size of the memory
> region).
> + * However, the alignment of the memory region properly considers the
> + * page size of the memory region.
> + */
> + return object_property_get_uint(OBJECT(md), VIRTIO_MEM_BLOCK_SIZE_PROP,
> + &error_abort);
> +}
> +
> static void virtio_mem_pci_size_change_notify(Notifier *notifier, void *data)
> {
> VirtIOMEMPCI *pci_mem = container_of(notifier, VirtIOMEMPCI,
> @@ -109,6 +122,7 @@ static void virtio_mem_pci_class_init(ObjectClass *klass,
> void *data)
> mdc->get_plugged_size = virtio_mem_pci_get_plugged_size;
> mdc->get_memory_region = virtio_mem_pci_get_memory_region;
> mdc->fill_device_info = virtio_mem_pci_fill_device_info;
> + mdc->get_min_alignment = virtio_mem_pci_get_min_alignment;
> }
>
> static void virtio_mem_pci_instance_init(Object *obj)
> diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c
> index 716eddd792..d8222153cf 100644
> --- a/hw/virtio/virtio-mem.c
> +++ b/hw/virtio/virtio-mem.c
> @@ -805,6 +805,14 @@ static void virtio_mem_get_block_size(Object *obj,
> Visitor *v, const char *name,
> const VirtIOMEM *vmem = VIRTIO_MEM(obj);
> uint64_t value = vmem->block_size;
>
> + /*
> + * If not configured by the user (and we're not realized yet), use the
> + * default block size.
> + */
> + if (!value) {
> + value = virtio_mem_default_block_size();
> + }
> +
> visit_type_size(v, name, &value, errp);
> }
>
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
- [PATCH v1 0/5] virtio-mem: block size and address-assignment optimizations, David Hildenbrand, 2020/09/23
- [PATCH v1 1/5] virtio-mem: Probe THP size to determine default block size, David Hildenbrand, 2020/09/23
- [PATCH v1 2/5] virtio-mem: Check that "memaddr" is multiples of the block size, David Hildenbrand, 2020/09/23
- [PATCH v1 3/5] memory-device: Support big alignment requirements, David Hildenbrand, 2020/09/23
- [PATCH v1 4/5] memory-device: Add get_min_alignment() callback, David Hildenbrand, 2020/09/23
- [PATCH v1 5/5] virito-mem: Implement get_min_alignment(), David Hildenbrand, 2020/09/23
- Re: [PATCH v1 5/5] virito-mem: Implement get_min_alignment(),
Pankaj Gupta <=
- Re: [PATCH v1 0/5] virtio-mem: block size and address-assignment optimizations, David Hildenbrand, 2020/09/25